Manually operable portable infusion device

ABSTRACT

A portable therapeutic fluid delivery device and a method for delivering a therapeutic fluid into a body of a patient are provided. In one aspect the therapeutic fluid delivery device and the method can be implemented using at least one housing securable to the body of the patient, a reservoir coupled to the at least one housing, a therapeutic fluid dispensing mechanism, a memory component, a controller, at least one bolus delivery button configured to signal the controller to initiate the delivery of the therapeutic fluid into the body of the patient; and, an inadvertent initiation prevention mechanism adapted for preventing the patient from activating the at least one bolus delivery button.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of pending U.S. patentapplication Ser. No. 14/551,542 filed on 24 Nov. 2014, which is acontinuation of pending U.S. patent application Ser. No. 13/621,723, nowU.S. Pat. No. 8,894,632 issued 25 Nov. 2014, which is a continuation ofU.S. patent application Ser. No. 12/452,763, now U.S. Pat. No. 8,267,921issued 18 Sep. 2012, which is a 35 U.S.C. §371 national stage entry ofPCT/IL2008/001001, which has an international filing date of 20 Jul.2008 and claims priority to U.S. Provisional Patent Application No.60/961,527, filed on 20 Jul. 2007. The present application incorporatesherein by reference the disclosure of each of the above-referencedapplications in their entirety.

FIELD OF THE INVENTION

A system, device and a method for sustained medical infusion of fluidsare provided. More particularly, a miniature portable therapeutic fluiddelivery device that can be attached to a patient's body and accuratelydispense fluids to the patient's body is described. In someimplementations, the device can be activated using one or more buttonscoupled to electronic components.

BACKGROUND OF THE INVENTION

Medical treatment of several illnesses requires continuous drug infusioninto various body compartments, such as subcutaneous and intra-venousinjections. Diabetes mellitus patients, for example, require theadministration of varying amounts of insulin throughout the day tocontrol their blood glucose levels. In recent years, ambulatory portableinsulin infusion pumps have emerged as a superior alternative tomultiple daily syringe injections of insulin. These pumps, which deliverinsulin at a continuous basal rate as well as in bolus volumes, weredeveloped to liberate patients from repeated self-administeredinjections, and allow them to maintain a near-normal daily routine. Bothbasal and bolus volumes must be delivered in precise doses, according toindividual prescription, since an overdose or under-dose of insulincould be fatal.

The 1st generation of portable infusion pumps disclosed “pager-like”devices with a reservoir contained within the device's housing. In such1st generation devices, a long tube delivers insulin from the pumpattached to a patient's belt to a remote insertion site. Both basal andbolus volume deliveries in these “pager-like” devices are controlled viaa set of buttons provided on the device. Such devices are disclosed, forexample, in U.S. Pat. Nos. 3,771,694, 4,657,486 and 4,498,843. Thesedevices represent a significant improvement over multiple dailyinjections, but nevertheless, they all suffer from several majordrawbacks, among which are the large size and weight of the device.

These uncomfortable bulky devices are rejected by the majority ofdiabetic insulin users, since they disturb regular activities, such assleeping and swimming. In addition, the delivery tube excludes someoptional remote insertion sites, like buttocks, arms and legs. To avoidthe consequences of long delivery tube, a 2nd generation of pumps wasproposed. As described in the prior art, the 2nd generation systemsinclude a remote controlled skin adherable device with a housing havinga bottom surface adapted for contact with the patient's skin, areservoir disposed within the housing, and an injection needle adaptedfor communication with the reservoir. These skin adherable devicesshould be discarded every 2-3 days to avoid irritation and infection.This paradigm was described, for example, in U.S. Pat. Nos. 5,957,895,6,589,229, 6,740,059, 6,723,072 and 6,485,461. However, these 2ndgeneration devices also have limitations: they are bulky and expensive.The high selling price is due to the high production and accessorycosts. Moreover, such systems are expensive for users since they must bediscarded every 2-3 days, including the relatively expensive components,such as the driving mechanism and other electronics.

Another major drawback of these 2nd generation skin adherable devicesconcerns the remote controlled drug administration. The users aretotally dependent on the remote control and cannot initiate a bolusdelivery if the remote control is not at hand, lost or has malfunctioned(practically, the patient cannot eat).

In some 2nd generation devices, a manual bolus button is disclosed, forexample in U.S. Pat. No. 6,740,059, assigned to Insulet Corporation.When pressed, the spring loaded button moves a release finger away froma bolus delivery tube, thus enabling the delivery of a fixed amount offluid from a bolus volume accumulator to the exit port of the device.This system has several drawbacks:

-   -   1 Unsafe: a life-threatening, unwanted bolus can be delivered by        unintentional pressing of the button.    -   2. Not tailored to patient needs: a one size accumulator allows        one bolus dose per button press. Thus, for example, if the        accumulator volume is 0.2 units of insulin, a toddler that needs        an average bolus dose of 1 unit has to press the button 5 times;        however an adult that requires an average bolus dose of 6 units        has to press the button 30 times. If, for example, the        accumulator volume is 1 unit, the same adult needs 6 button        presses but it limits most kids from using manual bolus        delivery.    -   3. Prolonged manual bolus administration: the user has to wait        for the accumulator to be refilled before the next consecutive        bolus. For example, if 10 presses are required and the filling        time is 0.5 minutes, the bolus administration time is 5 minutes.    -   4. Enlargement of the device's overall size: the employment of        two reservoirs, one for basal delivery and one for bolus        delivery, as well as two separate tubes and additional        mechanical components (e.g. spring) requires enlargement of the        device's overall size.

A mechanical bolus button, suffering from the same abovementioneddrawbacks, was also disclosed in U.S. Patent Application No.2004/0162518, and U.S. Pat. No. 6,702,779 assigned to Becton, Dickinsonand Company.

A 3rd generation skin adherable device was devised to avoid the costissues of the 2nd generation and to extend patient customization. Anexample of such a device was described in co-owned/co-pending U.S.patent application Ser. No. 11/397,115 and International PatentApplication No. PCT/IL06/001276, disclosers of which are incorporatedherein by reference in their entireties. This 3rd generation devicecontains a remote control unit and a skin adherable dispensing patchunit (also referred to as “dispensing unit” or “dispensing patch”) thatis comprised of two parts:

-   -   Reusable part—including the driving mechanism, fluid dispensing        mechanism, electronics and other relatively expensive        components.    -   Disposable part—including inexpensive, disposable components        such as reservoir, tube and batteries, and an outlet port.

This 3rd generation device/system provides a cost-effective skinadherable infusion device/system and allows diverse usage such asvarious reservoir sizes, various needle and cannula types, etc.

This 3rd generation skin adherable device, similarly to 2nd generationdevices, can also be remotely controlled. However, it is desirable thatmanual initiation of fluid delivery will be possible when the remotecontrol unit is not at hand (or not included), for at least one of basaland bolus drug delivery.

SUMMARY OF THE INVENTION

A portable therapeutic fluid delivery device and a method for deliveringa therapeutic fluid into a body of a patient are provided. In one aspectthe therapeutic fluid delivery device and the method can be implementedusing at least one housing securable to the body of the patient; areservoir for containing the therapeutic fluid, said reservoir coupledto the at least one housing; a therapeutic fluid dispensing mechanismcoupled to said reservoir; a memory component adapted for storing avalue corresponding to a therapeutic fluid delivery dose; a controlleradapted for initiating a delivery of the therapeutic fluid by activatingthe therapeutic fluid dispensing mechanism, said controller furtheradapted for limiting the delivery of the therapeutic fluid based on thevalue stored in the memory component; at least one bolus delivery buttonconfigured to signal the controller to initiate the delivery of thetherapeutic fluid into the body of the patient; and, an inadvertentinitiation prevention mechanism adapted for preventing the patient frominadvertently activating the at least one bolus delivery button.

In one implementation, the therapeutic fluid dispensing mechanismcomprises a pump. In another implementation, the therapeutic fluiddelivery device comprises two or more bolus delivery buttons and theinadvertent initiation prevention mechanism prevents the controller frominitiating the delivery of the therapeutic fluid into the body of thepatient unless the patient activates the two or more bolus deliverybuttons substantially simultaneously. In another implementation, thedevice comprises two or more bolus delivery buttons and the inadvertentinitiation prevention mechanism prevents the controller from initiatingthe delivery of the therapeutic fluid into the body of the patientunless the patient activates the two or more bolus delivery buttonsaccording to an activation sequence.

The controller can further be adapted to interrupt the delivery of thetherapeutic fluid into the body of the patient in response to a commandreceived from the patient. In one implementation, the patient can sendthe command by using the at least one bolus delivery button. In anotherexample, a notification component can be provided which is adapted forsending a notification to the patient corresponding to the delivery ofthe therapeutic fluid. For example, the notification can be at least oneof the visual notification, audio notification and tactile notification.

In one implementation, the at least one bolus delivery button comprisesa slidable portion. In another implementation, the at least one bolusdelivery button comprises a rotatable element. In yet anotherimplementation, a first of the at least one bolus delivery buttons ispositioned on a first side of the therapeutic fluid delivery device anda second of the at least one bolus delivery buttons is positioned on asecond side of the therapeutic fluid delivery device.

The fluid delivery device, for example, can comprise three units: adispensing patch unit (also referred to as “dispensing unit” or“dispensing patch”), a skin adherable cradle unit and a remote controlunit. The dispensing patch unit may employ different dispensingmechanisms, such as a syringe-type reservoir with a propelling plungeror a peristaltic positive displacement mechanism, and the like. Afterattaching the cradle unit to the skin, a cannula is inserted into thesubcutaneous compartment through a dedicated passage (“well”) in thecradle unit. The dispensing patch unit can then be connected to thecradle unit. The dispensing patch unit's outlet port is provided with ashort connecting lumen which pierces a self-sealable rubber septum thatseals the well. The connecting lumen allows fluid communication betweenthe dispensing patch unit and the cannula. The dispensing patch unit canbe connected to and disconnected from the skin adherable cradle unitupon patient discretion. In one preferred embodiment, a remote controlunit communicates with the dispensing patch unit and allows programmingof therapeutic fluid delivery, and allows user input and dataacquisition. In another preferred embodiment, bolus delivery programmingis carried out manually by manually operating bolus switch(es)/button(s)(“buttons”) located on the dispensing patch unit, which thenelectronically control the dispensing patch unit. In yet anotherpreferred embodiment, bolus delivery programming can be carried outeither by a remote control unit or manually by electronically operatingbolus button/s located on the dispensing patch unit.

In one preferred embodiment, the dispensing patch unit comprises twoparts: a reusable part and a disposable part. The disposable part cancontain a reservoir and an outlet port, and the reusable part cancontain electronics, at least a

portion of a fluid dispensing mechanism and bolus button/s for manuallyinitiating electronically operated bolus dosage delivery in case theremote control unit is not at hand, lost, nonfunctional, or in case theuser wishes to initiate bolus dosage delivery in a discreet mannerwithout using the remote control unit.

In a preferred embodiment, the reusable part of the dispensing patchunit is provided with two buttons which are located oppositely from eachother on the lateral walls of the reusable part's housing. In order toinitiate bolus dosage delivery, the patient is required to press bothbuttons simultaneously, thus ensuring that bolus delivery cannot beinitiated unintentionally. The bolus buttons, according to one preferredembodiment, are electronic switches, i.e. each button serves as acontact switch together with a portion of the printed circuit board(PCB) which is coated with a conductive material. When the patientpresses the two buttons simultaneously, both switches are in an “ON”state, thus a signal is sent to the central processing unit (CPU) toactivate the motor such that a bolus dose will be delivered.Alternatively, the buttons may be set up such that pressing both buttonswould place the switches in an “OFF” state (i.e., disconnecting one ormore “status” circuits within the unit). Such embodiments may or may notinclude the ability to supply basal dosages to the patient.

A portable therapeutic fluid delivery device capable of supplying bothbasal and bolus doses of a therapeutic fluid can also be provided. Forexample, it can include a dispensing unit comprising a reservoir forcontaining the therapeutic fluid, a pump for enabling fluid to flow outof the reservoir and through a delivery tube to a patient, a controllerfor controlling operation of the pump and a plurality of buttons capableof being depressed by a patient/user, wherein depressing the buttons issensed by the controller to enable a bolus dose to be delivered to thepatient.

In the above noted embodiment, the controller enables delivery of thebolus dose only upon the plurality of buttons being simultaneously orsequentially pressed, and if the controller is setup to enable deliveryof the bolus dose upon sequential pressing of the buttons, such setupmay include a predetermined order of sensed sequential pressing of thebuttons. Such depressing of the buttons may establish a circuit in thedevice which is sensed by the controller.

The controller of the portable therapeutic fluid delivery device maycomprise a processor capable of being programmed to delivery a specific,predetermined amount of the therapeutic fluid per bolus dose, which canbe modified by the patient/user (or healthcare professional).

A method for delivering a therapeutic fluid using a portable therapeuticfluid delivery device is also described. In some implementations themethod may include providing a therapeutic fluid delivery device(according to any one of the above-noted embodiments), and depressingthe plurality of buttons either simultaneously or sequentially which issensed by the controller to deliver a bolus dose of the therapeuticfluid.

For example, electronic bolus buttons can have the following advantages:

-   -   The bolus dosage can be delivered from the same reservoir as the        basal dosage. Thus, no additional space-consuming intermediate        reservoirs are required.    -   No additional mechanical components (e.g. springs, tubes, etc.)        are required. Thus, the miniature size and cost-effectiveness of        the dispensing patch are maintained.    -   The user can program the amount of therapeutic fluid (e.g.        insulin) to be delivered in a single pressing of the button/s.        For example, 0.5 unit for children, 1 unit for adults.        Alternatively, the CPU can be pre-programmed such that different        amounts of fluid will be delivered depending on the length of        time that the button/s is/are maintained pressed. For example,        0.5 unit when the button/s is/are maintained pressed for 2        seconds, 0.75 units when the button/s is/are maintained pressed        for 3 seconds, etc. It should be noted, however, that the        maximum programmable amount for a single pressing of the        button/s should be limited by the dispensing patch's software to        prevent drug overdose.    -   The user can press the button/s several times consecutively        without wait. In some embodiments a minimal waiting period        between two consecutive pressings may be required for system        adjustment (e.g. 1 second). The total amount of fluid to be        delivered in one bolus dosage (i.e. as a result of two or more        consecutive pressings of the button/s) should also be limited by        the dispensing patch's software in order to prevent a drug        overdose.    -   The CPU can be pre-programmed such that after initiating the        bolus delivery the user can interrupt the fluid delivery by        pressing the button/s again. Interrupting the fluid delivery may        require, for example, pressing the button/s for a prolonged        period (e.g. longer than 5 seconds).    -   The CPU can be pre-programmed such that pressing one button        initiates bolus delivery, whereas pressing a second button        interrupts the bolus delivery.    -   The CPU can be pre-programmed to give the user appropriate        indications via the notification component, for example in the        following cases:        -   Proper pressing of the button/s which results in bolus            dosage delivery.        -   Faulty pressing of the button/s which does not result in            bolus dosage delivery. Examples of faulty pressing of the            button/s could be pressing only one button when two or more            buttons are employed, keeping one or more buttons pressed            for a period of time which exceeds a pre-programmed period            of time (e.g. 1 minute), etc.        -   Reaching the pre-programmed limit of the fluid amount which            can be delivered in one bolus dosage.

In some implementation a device that contains a skin adherable infusionunit (also referred to as “dispensing patch unit”, “dispensing unit” or“dispensing patch”) that employs means for manually initiating bolusdosage delivery can be provided. In some implementations, a dispensingpatch unit that employs bolus dosage delivery means that is manuallyinitiated and electronically operated can also be provided. For example,a device can contain a dispensing patch that is programmable by a remotecontrol unit and in addition employs means for bolus dosage deliverythat is manually initiated and electronically operated. The dispensingpatch, in some implementations, can be attached to the body at anydesired location, and employ means for bolus dosage delivery that ismanually initiated and electronically operated.

In some implementations, a dispensing patch can have a thin profile(i.e. it can be discreet), has no tubing, and employs means for bolusdosage delivery that is manually initiated and electronically operated.A dispensing patch can also comprise a reusable part and a disposablepart. The reusable part can contain electronics, fluid dispensingmechanism, and means for bolus dosage delivery that is manuallyinitiated and electronically operated, and the disposable part containsa reservoir and outlet port.

A dispensing patch can employ means for bolus dosage delivery that canbe manually initiated and electronically operated, and that is safe andavoid unintentional pressing and consequently unwanted bolus doses. Adispensing patch can also employ means for bolus dosage delivery that ismanually initiated and electronically operated, and that is simple andcost-effective.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1a-c provide some examples of a single-part dispensing patch unit,a two-part dispensing patch unit and a remote control unit.

FIGS. 2a-c provide some examples of a dispensing patch unit directlyadhered to a patient's skin.

FIGS. 3a-c show exemplary connection of a dispensing patch unit to acradle unit.

FIGS. 4a-b provide some examples of a single-part dispensing patch unit,a two-part dispensing patch unit, a remote control unit and a cradleunit.

FIGS. 5a-b provide some examples of the dispensing patch unit and thecradle unit before and after connection.

FIGS. 6a-b provide some examples of a dispensing patch unit with asingle bolus button.

FIGS. 7a-b provide some examples of a dispensing patch unit with twobolus buttons.

FIGS. 8a-b provide some examples of a dispensing patch unit whichemploys a peristaltic pumping mechanism with manual bolus buttons.

FIGS. 9a-b provide some examples of a dispensing patch unit whichemploys a syringe-type pumping mechanism with manual bolus buttons.

FIGS. 10a-b provide some examples of a dispensing patch unit with manualbolus buttons.

FIG. 11 provides some examples of a reusable part with manual bolusbuttons, the operation of which is based on electronic switches.

FIGS. 12a-b show side and perspective views of the two parts of theexemplary bolus button.

FIGS. 13a-b show perspective and cross-sectional views of the exemplarybolus button when it is not pressed.

FIGS. 14a-b show the exemplary bolus button being pressed.

FIG. 15 shows the electronic circuits of the two contact switchescorresponding to the two exemplary bolus buttons.

FIG. 16 shows two exemplary bolus buttons being pressed simultaneously.

FIG. 17 shows an exemplary reusable part provided with manual bolusbuttons, the operation of which is based on capacitive sensing.

FIGS. 18a-b show perspective views of the exemplary bolus button beingpressed.

FIG. 19 shows an embodiment of a dispensing patch unit provided with asingle exemplary bolus button.

FIGS. 20a-b show cross-sectional views of the exemplary reusable partduring the activation of the bolus button.

FIG. 21 shows another embodiment of an exemplary dispensing patch unitprovided with an exemplary single bolus button.

FIGS. 22a-b show cross-sectional views of the reusable part during theactivation of the exemplary bolus button.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1a shows a fluid delivery device (1) comprising a dispensing patchunit (10). The fluid delivery device (1) may also comprise a remotecontrol unit (40). The dispensing patch unit (10) may be composed of asingle part (FIG. 1b ) or two parts (FIG. 1c ), e.g. a reusable part(100) and a disposable part (200).

FIGS. 2a-c show an example of direct adherence of a dispensing patchunit (10) to the patient's skin (5). FIG. 2a shows the peeling of anadhesive protective sheet (101) from the dispensing patch unit (10).FIG. 2b shows the adherence of the dispensing patch unit (10) to thepatient's skin (5). FIG. 2c shows the dispensing patch unit (10) adheredand ready for operation.

In another preferred embodiment shown in FIGS. 3a-c the device alsoemploys a cradle unit (20), which can be adhered first to the patient'sskin (5) and the dispensing patch unit (10) can then be connected to anddisconnected from the cradle unit (20) upon patient discretion. Thedevice employing the cradle unit is described in our U.S. patentapplication No. 60/876,679, incorporated herein by reference in itsentirety.

FIG. 3a shows the cradle unit (20) adhered to the patient's skin (5).FIG. 3b shows the connection of the dispensing patch unit (10) to theadhered cradle unit (20). FIG. 3c shows the dispensing patch unit (10)connected to the cradle unit (20) and ready for operation.

FIG. 4a shows the fluid delivery device comprising a single-partdispensing patch unit (10), cradle unit (20) and remote control unit(40). The dispensing patch unit (10) is connected to the cradle unit(20) after adherence of the cradle unit (20) to the patient's skin (5).In some implementations, infusion programming can be carried out eitherby a remote control unit (40) having a bidirectional communication link(for example) with the transceiver provided in the dispensing patch unit(10) or by one or more manual bolus buttons (15) provided in thedispensing patch unit (10). The employment of manual bolus button/s in askin adherable dispensing patch unit (10) is highly advantageous sinceit allows the delivery of bolus dosages of therapeutic fluid (e.g.insulin) without requiring the use of the remote control unit (40). Suchmanual operation of the infusion pump may be required, for example, ifthe remote control unit is nonfunctional, lost or not at hand, or if thepatient wishes to initiate bolus delivery discreetly. The bolusbutton/s, in some implementations, can be electronic, as will beexplained in detail below.

In some implementations the button/s can be further used to interruptthe fluid delivery. For example, after pressing the button/s to initiatethe fluid delivery, the user can interrupt the fluid delivery bypressing the button/s again. Interrupting the fluid delivery mayrequire, for example, pressing the button/s for a prolonged period (e.g.longer than 5 seconds). In some implementations the setup may be suchthat pressing one button initiates the fluid delivery, whereas pressinga second button interrupts the fluid delivery.

FIG. 4b shows the fluid delivery device comprising a two-part dispensingpatch unit (10), a cradle unit (20) and a remote control unit (40). Inthis embodiment the manual bolus button/s (15) are located on thereusable part (100) of the dispensing patch unit (10).

FIG. 5a shows an example of a two-part dispensing patch unit (10) and acradle unit (20) after a cannula (330) has been inserted into thesubcutaneous tissue (4) and before connection of the dispensing patchunit (10) to the cradle unit (20). The dispensing patch unit (10)contains, inter alia, a fluid reservoir (220), outlet port (213) andconnecting lumen (214) that maintains fluid communication between thereservoir (220) and the cannula (330).

FIG. 5b shows the connection of the dispensing patch unit (10) to thecradle unit (20). Upon connection of the two units, the connecting lumen(214) pierces a septum (311) sealing the cradle unit's (20) dedicatedfluid passage (“well”) (310), thus allowing fluid delivery via thecannula (330) to the subcutaneous tissue (4). The outlet port (213)allows repetitive connection and disconnection of the dispensing patchunit (10) to and from the cradle unit (20).

FIGS. 6a-b show a user manually operating a single-part dispensing patchunit (10) (FIG. 6a ), and a two-part dispensing patch unit (10) (FIG. 6b), by pressing a single bolus button (15) provided on the dispensingpatch unit (10). In case a two-part dispensing patch unit (10) is used,the bolus button (15) is preferable located on the reusable part (100).

FIGS. 7a-b show a user manually operating a single-part dispensing patchunit (10) (FIG. 7a ), and a two-part dispensing patch unit (10) (FIG. 7b), by simultaneously pressing two bolus buttons (15, 16) provided on thedispensing patch unit (10). In case a two-part dispensing patch unit(10) is used, the bolus buttons (15, 16) are preferable located on thereusable part (100).

It will be noted that the dispensing patch unit may otherwise beprovided with more than two bolus buttons. It will also be noted thatthe location of the button/s on the dispensing patch unit is not limitedto any specific location, and FIGS. 6-7 demonstrate only one example ofthe various possible locations of the bolus button/s on the dispensingpatch unit.

The dispensing patch unit (10) may employ different dispensingmechanisms (e.g. syringe-type reservoir with a propelling plunger,peristaltic pump, or other mechanisms which can be used to dispensefluid from a corresponding reservoir), and various types of drivingmechanisms (e.g. DC or stepper motors, SMA actuator, etc.). Manual bolusbuttons, in some implementations, may be employed in any one of thedifferent types of a dispensing patch unit.

FIGS. 8a-b show an example of a two-part dispensing patch unit (10)which employs a peristaltic pumping mechanism and is provided with bolusbuttons (15, 16). FIG. 8a shows the reusable part (100) and thedisposable part (200) prior to connection. Each part is contained in aseparate housing. The reusable part (100) comprises a rotary wheel (110)provided with rollers (not shown), driving mechanism (120), printedcircuit board (PCB) (130) with electronic components and bolus buttons(15, 16). The location of the bolus buttons (15, 16) on the reusablepart (100), as well as the number of bolus buttons, may vary. Thedisposable part (200) comprises a reservoir (220) provided with an inletport (212) for filling, delivery tube (230), energy supply means (240)which can be one or more batteries, outlet port (213) and stator (250).Fluid dispensing is possible after connecting the reusable part (100)with the disposable part (200). Rotation of the rotary wheel (110) andpressing of rollers against the stator (250) periodically positivelydisplaces fluid from the reservoir (220) into the delivery tube (230) byvirtue of a peristaltic motion. The fluid is then delivered via acannula into the subcutaneous compartment. This arrangement is describedin co-owned/co-pending U.S. patent application Ser. No. 11/397,115 andInternational Patent Application No. PCT/IL06/001276, disclosers ofwhich are incorporated herein by reference in their entireties.

FIG. 8b shows the dispensing patch unit (10) after connection of thereusable (100) and disposable (200) parts.

FIGS. 9a-b show an example of a two-part dispensing patch unit (10)which employs a syringe-type pumping mechanism and is provided withmanual bolus buttons (15, 16).

FIG. 9a shows the reusable part (100) and the disposable part (200)prior to connection. Each part is contained in a separate housing. Inthis embodiment, the plunger (210) is located in the disposable part(200). The disposable part also comprises a reservoir (220), energysupply means (240) and outlet port (213). The reusable part (100)comprises a driving mechanism (120), PCB (130) with electroniccomponents and manual bolus buttons (15, 16). The location of the bolusbuttons (15, 16) on the reusable part (100), as well as the number ofbolus buttons, may vary.

FIG. 9b shows the connection of the reusable (100) and disposable (200)parts, including the engagement of the plunger rod (211) with thedriving mechanism (120) and the establishment of electrical connectionbetween the energy supply means (240) and the PCB (130). Thisarrangement was described in co-owned/co-pending International PatentApplication No. PCT/IL08/000641, filed May 11, 2008, claiming priorityto U.S. Provisional Patent Application No. 60/928,815, entitled “Apositive displacement pump”, filed May 11, 2007, the disclosure of whichis incorporated herein by reference in its entirety.

FIGS. 10-16 show a preferred embodiment of a two-part dispensing patchunit which employs a peristaltic pumping mechanism and includes bolusbuttons for enabling the device to dispense a bolus dose without the useof a remote control unit. It will be noted that all bolus buttons'configurations and/or mechanisms described below may also be implementedin a single-part dispensing patch unit and in a dispensing patch unitemploying a non-peristaltic pumping mechanism, e.g. a syringe-typemechanism.

FIG. 10a shows a reusable part (100) and a disposable part (200)contained in separate housings. In this embodiment two bolus buttons(15, 16) are provided for safety reasons, as will be explained below.The bolus buttons (15, 16) in this embodiment are located on thereusable part (100), and they are preferably fabricated using anover-molding process, i.e. the housing of the reusable part (100) ispre-molded having two dedicated apertures, and it is then placed in asecond mold so that the bolus buttons (15, 16) are fabricated inside thededicated apertures. This process assures that the reusable part, andconsequently the dispensing patch unit, remains water-tight. The bolusbuttons (15, 16) are preferably fabricated from a resilient material,e.g. rubber.

FIG. 10b shows the dispensing patch unit (10) after connection of thetwo parts.

FIG. 11 shows the reusable part (100) without its housing. In thisembodiment, each bolus button (e.g. the button designated by numeral 15)may include a button portion (151) which is accessible to the patientand is preferably fabricated from a resilient material, e.g. rubber, andbutton contacts, i.e. a metal strip (155) which is soldered to the PCB(130) and serves as a contact switch together with a portion of the PCB(130), as will be explained below.

FIGS. 12a-b show side and perspective views (respectively) of the twoparts of the bolus button (15); the button portion (151) and the metalstrip (155), which is soldered to the PCB (130). The button portion(151) has a protrusion (152) on its inwardly facing side, which isdesigned to fit into the concave portion (156) of the metal strip (155).It will be noted that the two bolus buttons in this embodiment areidentical, therefore the above description, as well as all furtherdescriptions relating to one of the buttons, applies to both bolusbuttons equally.

FIGS. 13a-b show perspective and cross-sectional views (respectively) ofthe bolus button (15) in an initial position (prior to being depressed).It can be seen that when not pressed, the protrusion (152) on theinwardly facing side of the button portion (151) is positioned in closeproximity to the metal strip (155) on its concave portion (156).

In this embodiment, the PCB (130) is provided with conductive pads (e.g.fabricated of gold or other conductive material) (132) at the twosoldering points (158, 159) of the metal strip (155) and on a portion ofthe lateral face of the PCB (130) which is located between saidsoldering points (158, 159). The conductive pads (132) form a contactswitch together with the button's metal strip (155).

FIGS. 14a-b shows a user pressing the bolus button (15). When the bolusbutton (15) is pressed, the button portion (151) curves inwardly. As aresult, the protrusion (152) on the button portion's inwardly facingside comes in contact with the metal strip (155) and pushes it againstthe conductive pad (132) on the lateral face of the PCB (130). Whencontact is established between the metal strip (155) and the conductivepad (132), a short circuit occurs, and the switch is in an “ON” state.

In order to prevent inadvertent initiation of bolus dosage delivery, twobuttons are provided. Thus, in some implementations, only simultaneouspressing of the two buttons (both switches are in an “ON” state) willinitiate bolus dosage delivery (or sequential depressing of thebuttons). It will be noted that the two bolus buttons are preferablypositioned opposite from each other, e.g. on opposite lateral walls ofthe dispensing patch unit's reusable part, in order to preventunintentional simultaneous pressing of the buttons.

An arrangement of one button with a locking mechanism (preferablyautomatic locking), in which the locking mechanism must be held in anunlocked position to press the button, and other similar embodiments,can also be used in some implementations (see, for example, FIGS. 19-22and accompanying description).

FIG. 15 shows the electronic circuits of the two contact switchescorresponding to the two bolus buttons (15, 16). Both circuits areconnected to the ground on one end and to a power source and the CPU'sinlet port on the other end.

FIG. 16 shows a user simultaneously pressing the two bolus buttons (15,16). Both switches are now in an “ON” state, thus a signal is sent tothe CPU (140) to activate the motor (122) such that a bolus dose oftherapeutic fluid (e.g. insulin) is delivered. The CPU (140) in thisembodiment is programmed to execute bolus delivery only when bothswitches are in an “ON” state, i.e. a logic command of (Switch 1 ANDSwitch 2). If only one switch is in an “ON” state (i.e. only one buttonis being properly pressed), a bolus dosage will not be delivered. TheCPU (140) can also indicate to the patient, via the notificationcomponent (145), if bolus delivery has been initiated. The CPU (140) mayalso be programmed to alert the patient via the notification component(145) if bolus delivery has not been initiated due to faulty pressing ofthe bolus buttons (e.g. only one button is being properly pressed). Thenotification component (145) may be audible (e.g. a buzzer), visible(e.g. flashing lights) or tactile (e.g. vibrator).

An alternative embodiment may include a commercially available tactileswitch (e.g. tact switches manufactured by Alps Electric Co., Ltd.,Japan), which is soldered to the PCB and connected to the CPU, insteadof providing a dedicated metal strip in each bolus button, thussimplifying the manufacturing process of the buttons. If a commerciallyavailable tactile switch is used, then when the user presses the buttonportion, the protrusion on its inwardly facing side is pushed againstthe tactile switch, thus turning it on. When the user presses bothbuttons simultaneously, both tactile switches are in an “ON” state, thusa signal is sent to the CPU to activate the motor such that a bolus doseof therapeutic fluid (e.g. insulin) is delivered.

It will be noted, that the buttons may alternatively be set up such thatpressing a button would place the switch in an “OFF” state (i.e.,disconnecting one or more “status” circuits within the unit), and bolusdelivery would be initiated only when both switches are in an “OFF”state (or when the buttons are sequentially pressed).

FIGS. 17-18 show another embodiment of electronic bolus buttons. In thisembodiment the operation of the buttons is based on sensing capacitancechanges, as will be explained below.

FIG. 17 shows an embodiment of a reusable part (100) provided with twobolus buttons (17, 18). In this embodiment each bolus button (e.g. thebutton designated by numeral 17) consists of a button portion (171),which is accessible to the patient and is preferably configured as athin sheet fabricated from non-conductive material (e.g. rubber,plastic), and a capacitor which is comprised of two conductive pads(175, 176) provided on the PCB (130). The conductive pads (175, 176) maybe parallel to each other or they may be configured as two concentricannuli pads, or as one circular pad surrounded by a second pad having auniform gap between the two pads, etc. The buttons are provided with atleast one commercially available sensor chip (178) (e.g. a sensor chipmanufactured by Omron Electronic Components Europe B. V., TheNetherlands), which charges the capacitors.

Accordingly, when the user presses the button portion (171) against theconductive pads (175, 176), the user's finger, which has conductiveproperties, adds conductive surface area to the conductive pads (175,176), thus increasing the capacitor's capacitance. The sensor chip (178)measures the capacitor's capacitance, and either signals the CPU (140)when the button (17) is pressed, according to a preprogrammedcapacitance threshold (or derivative voltage threshold, etc.), ortransmits to the CPU (140) the measured capacitance, and the CPU (140)determines if the button (17) is pressed or not according to apreprogrammed capacitance threshold (or derivative voltage threshold,etc.). For safety reasons, the threshold should be determined such thatthe capacitance (or voltage, etc.) threshold will be reached only whenthe button (17) is completely pressed, i.e., when the button portion(171) touches the conductive pads (175, 176). The CPU (140) can beprogrammed to execute bolus delivery only when both buttons are beingpressed and to indicate to the patient, via the notification component(145), whether a bolus delivery has been initiated or not.

FIGS. 18a-b show perspective views of one of the bolus buttons (17)being pressed. The bolus button (17) comprises two conductive pads (175,176) provided on the PCB (130), and a button portion (171) which isconfigured as a thin sheet fabricated from non-conductive material, e.g.rubber, plastic, etc.

In some implementations, the bolus buttons can be using the “HallEffect”. For example, each button can comprise a button portion which islocated on the reusable part's housing (in case of a two-part dispensingpatch unit), and is preferably fabricated from a resilient material,e.g. rubber, using the over-molding process. At least one magnet caneither be embedded in the button portion or protrudes from it, in thebutton portion's inwardly facing side. In addition, each button isprovided with a Hall Effect sensor, which is attached to the PCB inproximity to the button portion, and is connected to the CPU eitherdirectly or via another electronic component, e.g. a comparator. Whenthe button is not being pressed, the electrical signal transmitted bythe Hall Effect sensor remains constant. When the button is beingpressed, the magnet is moved towards the dedicated Hall Effect sensor,thus exposing the sensor to the magnet's magnetic field and causing theelectrical signal transmitted by the Hall Effect sensor to peak. The CPUcan be programmed to execute bolus delivery only when both buttons arebeing pressed, i.e., when the electrical signals transmitted by bothHall Effect sensors peak simultaneously. The CPU is also preferablyprogrammed to indicate to the patient, via the notification component,whether bolus delivery has been initiated or not.

FIGS. 19-22 show some implementations, in which the dispensing patchunit is provided with a single bolus button. In order to preventunintentional pressing of the button, safety mechanisms are employed, aswill be explained further. The embodiments described below can beemployed in either a single-part dispensing patch unit or a two-partdispensing patch unit.

FIG. 19 shows an embodiment of a two-part dispensing patch unit (10)provided with a single bolus button (19). The bolus button (19) can bepositioned in the center of the reusable part's (100) upwardly facingside, or in any other location on the reusable part's (100) housingwhich is accessible to the patient when the dispensing patch unit (10)is connected to the cradle unit (not shown).

FIGS. 20a-b show cross-sectional views of the reusable part (100) duringthe activation of the bolus button (19). The reusable part's (100)housing is configured to have an elongated depression (500) providedwith at least one horizontal track and one vertical track in eachlateral wall of the depression (only one horizontal track and onevertical track are shown, and they are designated by numerals 501 and502 respectively). A portion (503) of the depression's (500) bottom sideis fabricated from a resilient material, e.g. rubber, preferably usingan over-molding process. The resilient portion (503) of the depressionmay have a protrusion (504) protruding inwardly towards the PCB (130).The bolus button (19) comprises a slidable portion (190), which ispreferably fabricated from a relatively rigid material, e.g. plastic,and an electronic switch (195), which can be, for example, acommercially available tactile switch (e.g. a tact switch manufacturedby Alps Electric Co., Ltd., Japan), or any other electronic switch. Theelectronic switch (195) is soldered to the PCB (130) and connected tothe CPU (140). The slidable portion (190) has at least two lateralprojections, oppositely positioned, which fit inside the tracks (501,502) in the lateral walls of the depression (500), and can move alongsaid tracks. Said projections are not shown, however a rectangular mark(191) indicates one possible location of the projections on the slidableportion's (190). The slidable portion (190) has in addition a protrusion(192) on its inwardly facing side.

The bolus button (19) can be provided with two springs (197, 198). Afirst spring (197) is preferably attached in one end to the bottom sideof the slidable portion (190), inside a dedicated depression (193), andin the other end to the reusable part's (100) housing. A second spring(198) is preferably attached in one end to the bottom side of theslidable portion (190), surrounding the protrusion (192), while itsother end is not attached to any other component.

In order to initiate bolus delivery, the patient is required to move theslidable portion (190) of the bolus button (19) along the horizontaltracks (501), as shown in FIG. 20a , until the slidable portion (190)reaches the end of the depression (500). Only then can the patient pushthe slidable portion (190) downwardly along the vertical tracks (502),as shown in FIG. 20b . Thus it is ensured that the bolus button (19)cannot be pressed unintentionally.

The horizontal movement of the slidable portion (190) causes the firstspring (197) to stretch diagonally. As the slidable portion (190) isbeing pushed downwardly, the second spring (198) is constricted againstthe reusable part's (100) housing, allowing the inwardly facingprotrusion (192) of the slidable portion (190) to push downwardly theresilient portion (503) of the reusable part's (100) housing. Theresilient portion (503) then pushes the electronic switch (195) with itsprotrusion (504), thus turning the switch (195) on. When the CPU (140)is signaled that the electronic switch (195) is in an “ON” state, itactivates the motor such that a bolus dose of therapeutic fluid (e.g.insulin) is delivered. The CPU (140) is also preferably programmed toindicate to the patient, via the notification component (145), whetherbolus delivery has been initiated or not.

When the patient lifts his finger off the bolus button's slidableportion (190), the resilient portion (503) of the reusable part's (100)housing disengages from the electronic switch (195). The second spring(198) stretches back to its initial position, thus pushing upwardly theslidable portion (190) of the button (19). The first spring (197) canthen constrict back to its initial position, while pulling the slidableportion (190) backwards along the horizontal tracks (501), until it isreturned to its initial position.

FIG. 21 shows another embodiment of a dispensing patch unit (10)provided with a single bolus button (26). In this embodiment the patientis required to rotate a rotatable portion of the bolus button (26) priorto pressing it, thus ensuring that the button (26) cannot be pressedunintentionally.

FIGS. 22a-b show cross-sectional views of the reusable part (100) duringthe activation of the bolus button (26). The button (26) comprises arotatable portion (260) and an electronic switch (265), which can be,for example, a commercially available tactile switch (e.g. a tact switchmanufactured by Alps Electric Co., Ltd., Japan), or any other electronicswitch. The electronic switch (265) is soldered to the PCB (130) andconnected to the CPU (140). The bolus button (26) is also provided witha torsion spring (267). The torsion spring's coil portion (268), as wellas one of its legs (269), is embedded in the rotatable portion (260) ofthe bolus button (26), whereas the second leg (not shown) is embedded inthe reusable part's (100) housing. The reusable part's (100) housing isconfigured to have a dedicated depression (600), which accommodates therotatable portion (260) of the bolus button (26). The rotatable portion(260) is fixed to the reusable part's (100) housing by means of adedicated hinge (601) located in the depression (600). A small portion(603) of the depression's (600) bottom side is fabricated from aresilient material, e.g. rubber, preferably using an over-moldingprocess. The resilient portion (603) of the depression may have aprotrusion (604) protruding inwardly towards the PCB (130).

In order to initiate a bolus delivery, the patient is required to rotatethe rotatable portion (260) of the bolus button (26) until it reachesthe opposite side of the depression (600). FIG. 22a shows across-sectional view of the reusable part (100) after the rotatableportion (260) of the bolus button (26) has been rotated. It is not shownbut it should be appreciated that rotational movement of the rotatableportion (260) loads the torsion spring (267).

FIG. 22b shows the patient pushing down the rotatable portion (260) ofthe bolus button (26). As the rotatable portion (260) is being pusheddown, its inwardly facing protrusion (262) pushes downwardly theresilient portion (603) of the reusable part's (100) housing, which inturn pushes the electronic switch (265) with its protrusion (604), thusturning the switch (265) on. When the CPU (140) is signaled that theelectronic switch (265) is in an “ON” state, it activates the motor suchthat a bolus dose of therapeutic fluid (e.g. insulin) is delivered. TheCPU (140) is also preferably programmed to indicate to the patient, viathe notification component (145), whether bolus delivery has beeninitiated or not.

When the patient lifts his finger off the bolus button's rotatableportion (260), the resilient portion (603) of the reusable part's (100)housing disengages from the electronic switch. The torsion spring (267)then unwinds, rotating the rotatable portion (260) back to its initialposition.

It will be noted, that a button may alternatively be set up such thatpressing the button would place the switch in an “OFF” state (i.e.,disconnecting one or more “status” circuits within the unit).

Other embodiments of a single bolus button may include a bolus buttonthe operation of which is based on capacitive sensing, or a bolus buttonthe operation of which is based on the Hall Effect, etc. Alternativesafety mechanisms may include, for example, a moveable safety capprovided in the dispensing patch unit's housing, etc.

Although particular embodiments have been disclosed herein in detail,this has been done by way of example for purposes of illustration only,and is not intended to be limiting with respect to the scope of theappended claims, which follow. In particular, it is contemplated thatvarious substitutions, alterations, and modifications may be madewithout departing from the spirit and scope of the invention as definedby the claims. Other aspects, advantages, and modifications areconsidered to be within the scope of the following claims. The claimspresented are representative of the inventions disclosed herein. Other,unclaimed inventions are also contemplated. The applicant reserves theright to pursue such inventions in later claims.

Any and all of the foregoing patents, applications, and publicationsreferenced in this specification are hereby incorporated by referenceherein in their entireties.

What is claimed is:
 1. A portable therapeutic fluid delivery device fordelivering a therapeutic fluid into a body of a patient comprising: areservoir for containing the therapeutic fluid; a dispensing mechanismfor dispensing the therapeutic fluid from the reservoir toward the bodyof the patient; a housing configured for securing to the body of thepatient, the housing accommodating the reservoir and the dispensingmechanism; a bolus delivery button configured to initiate the deliveryof the therapeutic fluid into the body of the patient; and a lockingmechanism adapted for preventing the patient from inadvertentlyactivating the bolus delivery button for the delivery of the therapeuticfluid into the body of the patient unless the locking mechanism is putin an unlocked position.
 2. The device of claim 1 further comprising asecond bolus delivery button, and the device is configured such that forthe initiation of the bolus dosage delivery, the two buttons must bepressed simultaneously, thus ensuring that bolus delivery cannot beinitiated unintentionally.
 3. The device of claim 2 where the two bolusdelivery buttons are located oppositely from each other on the lateralwalls of the housing.
 4. The device of claim 1 wherein the housing isconfigured to have an elongated depression provided with at least onehorizontal track and one vertical track in each lateral wall of thedepression, within which a slidable portion of the bolus delivery buttoncomprising lateral projections can move, first vertically to reach theunlocked position, and then horizontally to provide the initiation ofthe delivery of the therapeutic fluid.
 5. The device of claim 1 whereinthe locking mechanism comprises tracks in lateral walls of a depressionin the housing, the bolus delivery button comprising a slidable portioncomprising lateral projections, oppositely positioned, which fit insidethe tracks in the lateral walls of a depression in the housing, and canmove along the tracks.
 6. The device of claim 5 wherein the tracks areconfigured such that the slidable portion cannot be pressed downwardlyinto the housing of the device except when the slidable portion is at anend of the tracks.
 7. The device of claim 1 further comprising a secondbolus delivery button, each of the two bolus delivery buttons having aslidable portion, and each of the two bolus delivery buttons areprovided with two springs, a first spring attached in one end to thebottom side of the slidable portion, inside a dedicated depression, andin the other end to the reusable part's housing, and a second springattached at one end to the bottom side of the slidable portionsurrounding a protrusion, while its other end is not attached to anyother component.
 8. The device of claim 1 wherein the bolus deliverybutton comprises a protrusion on an inwardly facing side and theprotrusion is configured to push a switch for the initiation of thedelivery of the therapeutic fluid when the bolus delivery button ispressed inwardly and the locking mechanism is in the unlocked position.9. The method of claim 8 wherein the bolus delivery button is configuredof a rigid plastic.
 10. The device of claim 1 wherein the bolus deliverybutton comprises a rotatable portion, and the button is also providedwith a torsion spring, wherein a coil portion of the torsion spring aswell as a leg of the torsion spring are each embedded in the rotatableportion of the bolus button.
 11. The device of claim 10 wherein thehousing is configured to have a dedicated depression which accommodatesentirely therein the rotatable portion of the bolus delivery button. 12.The device of claim 10 wherein the rotatable portion is fixed to thehousing by a hinge located in the depression.
 13. The device of claim 10wherein the rotatable portion of the bolus delivery button comprises aninwardly facing protrusion.
 14. The device of claim 10 wherein therotatable portion of the bolus delivery button comprises an inwardlyfacing protrusion, and the housing is configured to have a dedicateddepression, and the device is configured such that when the patientpushes down the rotatable portion of the bolus delivery button, theinwardly facing protrusion pushes downwardly a resilient portion of thehousing, the resilient portion having a protrusion extending inwardly,which pushes a switch for the initiation of the delivery of thetherapeutic fluid.
 15. A portable therapeutic fluid delivery device fordelivering a therapeutic fluid into a body of a patient comprising: areservoir for containing the therapeutic fluid; a dispensing mechanismfor dispensing the therapeutic fluid from the reservoir toward the bodyof the patient; a housing configured for securing to the body of thepatient, the housing accommodating the reservoir and the dispensingmechanism; a first bolus delivery button to initiate the delivery of thetherapeutic fluid into the body of the patient; a second bolus deliverybutton to initiate the delivery of the therapeutic fluid into the bodyof the patient; and wherein the initiation of the bolus dosage deliveryrequires that the two buttons must be pressed simultaneously, thusensuring that the bolus delivery cannot be initiated unintentionally.16. The device of claim 15 further comprising a locking mechanismadapted for preventing the patient from inadvertently activating thefirst and the second bolus delivery button for the delivery of thetherapeutic fluid into the body of the patient unless the lockingmechanism is put in an unlocked position.
 17. The device of claim 16wherein the cradle unit comprises a dedicated fluid passage.
 18. Thedevice of claim 15 further comprising a cradle unit adherable to a skinof the patient.
 19. The device of claim 15 wherein the dispensingmechanism comprises a syringe-type pumping mechanism.
 20. The device ofclaim 15 wherein the dispensing mechanism comprises a plunger comprisinga plunger rod.